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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <malloc.h>

/* ioctl crap */
#define SYREN_RD 101
#define SYREN_WR 102
#define SYREN_OLD_RD 108
#define SYREN_OLD_WR 109

struct syren_io_args {
unsigned long page;
unsigned long addr;
unsigned long value;
};

typedef struct {
u_char page;
u_char addr;
const char *name;
} syren_reg;

static syren_reg registers[] = {
{ 0, 0x04, "TOGBR1" },
{ 0, 0x05, "TOGBR2" },
{ 0, 0x06, "VBDCTRL" },
{ 1, 0x07, "VBUCTRL" },
{ 1, 0x08, "VBCTRL" },
{ 1, 0x09, "PWDNRG" },
{ 1, 0x0a, "VBPOP" },
{ 1, 0x0b, "VBCTRL2" },
{ 1, 0x0f, "VAUDCTRL" },
{ 1, 0x10, "VAUSCTRL" },
{ 1, 0x11, "VAUOCTRL" },
{ 1, 0x12, "VAUDPLL" },
{ 1, 0x17, "VRPCSIMR" },
{ 0, 0, 0 }
};

static syren_reg *find_reg(const char *name)
{
int i;

for (i = 0; registers[i].name != 0; i++) {
if (!strcasecmp(registers[i].name, name))
return &registers[i];
}

return NULL;
}

static int usage(void)
{
fprintf(stderr, "usage: syren [r/w] [REGNAME | page:addr] (value)\n");
return 1;
}

int
syren_main(int argc, char **argv)
{
int cmd = -1;
syren_reg *r;
struct syren_io_args sio;
char name[32];
int fd;

if (argc < 3) {
return usage();
}

switch(argv[1][0]) {
case 'r':
cmd = SYREN_RD;
break;
case 'w':
cmd = SYREN_WR;
break;
case 'R':
cmd = SYREN_OLD_RD;
break;
case 'W':
cmd = SYREN_OLD_WR;
break;
default:
return usage();
}

if (cmd == SYREN_WR || cmd == SYREN_OLD_WR) {
if (argc < 4)
return usage();
sio.value = strtoul(argv[3], 0, 0);
}

fd = open("/dev/eac", O_RDONLY);
if (fd < 0) {
fprintf(stderr, "can't open /dev/eac\n");
return 1;
}

if (strcasecmp(argv[2], "all") == 0) {
int i;
if (cmd != SYREN_RD && cmd != SYREN_OLD_RD) {
fprintf(stderr, "can only read all registers\n");
return 1;
}

for (i = 0; registers[i].name; i++) {
sio.page = registers[i].page;
sio.addr = registers[i].addr;
if (ioctl(fd, cmd, &sio) < 0) {
fprintf(stderr, "%s: error\n", registers[i].name);
} else {
fprintf(stderr, "%s: %04x\n", registers[i].name, sio.value);
}
}

close(fd);
return 0;
}

r = find_reg(argv[2]);
if (r == NULL) {
strcpy(name, argv[2]);
char *addr_str = strchr(argv[2], ':');
if (addr_str == NULL)
return usage();
*addr_str++ = 0;
sio.page = strtoul(argv[2], 0, 0);
sio.addr = strtoul(addr_str, 0, 0);
} else {
strcpy(name, r->name);
sio.page = r->page;
sio.addr = r->addr;
}

if (ioctl(fd, cmd, &sio) < 0) {
fprintf(stderr, "ioctl(%d) failed\n", cmd);
return 1;
}

if (cmd == SYREN_RD || cmd == SYREN_OLD_RD) {
printf("%s: %04x\n", name, sio.value);
} else {
printf("wrote %04x to %s\n", sio.value, name);
}

close(fd);

return 0;
}
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